Method for manufacturing rail, and rail

The objective of the present invention is to propose welding conditions for forming welded joint portions stably at all times, and with which a difference in the hardness of a flash-butt welded joint portion and a rail base material and an amount of deflection during a bending test lie in an improve...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUOKA, Ryo, IIZUKA, Naoki, HONJO, Minoru, OKAMOTO, Shigeo
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING FERROUS OR NON-FERROUS ALLOYS MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	The objective of the present invention is to propose welding conditions for forming welded joint portions stably at all times, and with which a difference in the hardness of a flash-butt welded joint portion and a rail base material and an amount of deflection during a bending test lie in an improved range. When a plurality of rail base materials having a component composition containing C: 0.60 to 1.20% by mass, Si: 0.10 to 1.50% by mass, Mn: 0.10 to 1.50% by mass, and Cr: 0.10 to 1.50% by mass, the remainder being Fe and unavoidable impurities, are to be joined by way of a joint portion using flash-butt welding, the flash-butt welding is performed with a welding heat input amount at least equal to 1.50×10